MAX4281:SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps

The MAX4174/MAX4175/MAX4274/MAX4275 GainAmp family combines a low-cost rail-to-rail op amp with precision internal gain-setting resistors and VCC/2 biasing. Factory-trimmed on-chip resistors decrease design size, cost, and layout, and provide 0.1% gain accuracy. Fixed inverting gains from -0.25V/V to -100V/V or noninverting gains from +1.25V/V to +101V/V are available. These devices operate from a single +2.5V to +5.5V supply and consume only 300µA. GainAmp amplifiers are optimally compensated for each gain version, achieving exceptional GBW products up to 23MHz (AV = +25V/V to +101V/V). High-voltage fault protection withstands µ17V at either input without excessive current draw. Three versions are available in this amplifier family: single/dual/quad open-loop, unity-gain stable (MAX4281/MAX4282/MAX4284); single/dual fixed gain (MAX4174/MAX4274); and single/dual fixed gain plus internal VCC/2 bias at the noninverting input (MAX4175/MAX4275), which simplifies input biasing in single-supply designs. The input common-mode voltage range of the open-loop amplifiers extends from 150mV below the negative supply to within 1.2V of the positive supply. The outputs can swing rail-to-rail and drive a 1kΩ load while maintaining excellent DC accuracy. The amplifier is stable for capacitive loads up to 470pF.

Key Features
  • GainAmp Family Provides Internal Precision Gain-Setting Resistors in SOT23 (MAX4174/5)
  • 0.1% Gain Accuracy (RF/RG) (MAX4174/5, MAX4274/5)
  • 54 Standard Gains Available (MAX4174/5, MAX4274/5)
  • Open-Loop Unity-Gain-Stable Op Amps (MAX4281/2/4)
  • Rail-to-Rail Outputs Drive 1kΩ Load
  • Internal VCC/2 Biasing (MAX4175/MAX4275)
  • +2.5V to +5.5V Single Supply
  • 300µA Supply Current
  • Up to 23MHz GBW Product
  • Fault-Protected Inputs Withstand ±17V
  • Stable with Capacitive Loads Up to 470pF with No Isolation Resistor
MAX4174, MAX4175, MAX4274, MAX4275, MAX4281, MAX4282, MAX4284: Typical Operating Circuit
MAX4174, MAX4175, MAX4274, MAX4275, MAX4281, MAX4282, MAX4284: Typical Operating Circuit
  • Cellular Handsets
  • Digital Cameras (DIGICAMs)
  • Glucose Meters
  • GPS Solutions
  • Infrared Receivers for Remote Controls
  • Instruments, Terminals, and Bar-Code Readers
  • IP Camera
  • Keyless Entry
  • Low-Side Current-Sense Amplifiers
  • MP3 and Portable Media Players
  • Photodiode Preamps
  • Portable Instruments
  • Smart-Card Readers
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MAX4174-MAX4284 Data SheetMAX4174-MAX4284.pdf
Part NumberAmps.Rail to RailVSUPPLY (Total)
ICC per Amp.
Unity Gain BW
Slew Rate
minmaxtypmaxtyptypmaxtyptyp<See Notes
MAX42811Output Only2.55.5300200090901020.790SOIC(N)/8
$1.19 @1k
$1.69 @1k
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX4281ESANo Longer AvailableMAX4281ESA+SOIC(N),;8 pin;30.9 mm²-40°C to +85°CNo
MAX4281ESA+ActiveSOIC(N),;8 pin;30.9 mm²-40°C to +85°CLead Free
MAX4281ESA+TActiveN.SO;-40°C to +85°CSee data sheet
MAX4281ESA-TNo Longer AvailableMAX4281ESA+TN.SO;8 pin-40°C to +85°CSee data sheet
MAX4281EUK+ActiveSOT,;5 pin;9 mm²-40°C to +85°CLead Free
MAX4281EUK+TActiveSOT,;5 pin;9 mm²-40°C to +85°CLead Free
MAX4281EUK-TNo Longer AvailableMAX4281EUK+TSOT,;5 pin;9 mm²-40°C to +85°CNo
MAX4174-MAX4284.pdf MAX4282
Fixed-Gain Op Amps Simplify Filter Design MAX4282
MAX4174-MAX4284.pdf MAX4282